Room-temperature-curing acrylic heteropolysiloxane nano-ceramic protection coating and preparation method thereof

A technology of heteropolysiloxane and nano-ceramics, which is applied in the direction of coating, etc., can solve the problems of micropores, reduce crosslinking density, and easy cracks, etc., and achieve high hardness of coating film, uniform film formation, and stain resistance Good results

Active Publication Date: 2014-02-19
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of inorganic sol coatings such as poor film-forming properties, easy cracks, and micropores, by reducing the crosslinking density and introducing difunctional ...

Method used

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  • Room-temperature-curing acrylic heteropolysiloxane nano-ceramic protection coating and preparation method thereof
  • Room-temperature-curing acrylic heteropolysiloxane nano-ceramic protection coating and preparation method thereof
  • Room-temperature-curing acrylic heteropolysiloxane nano-ceramic protection coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of acrylic silicone wax

[0037] Into a 250ml three-necked flask equipped with a reflux device, 100g of liquid low-hydrogen polymethylhydrogensiloxane (also known as low-hydrogen silicone oil, active hydrogen content (Si-H) is 0.36wt%), 60.5 1 g of 1-octadecene, stir, add 1.5 g of platinum divinyltetramethyldisiloxane double head complex solution (Karsted catalyst) (the concentration of platinum is 1500ppm), and heat to 120°C for reaction After 3 hours, cool to 90° C., slowly add 8.6 g of acrylic acid (AA) dropwise, and keep the reaction for 3 hours. Then cooled to room temperature to obtain acrylic silicone wax polymer SA1. Infrared spectroscopy experiments show that the silicone wax synthesized by the hydrosilylation reaction does not contain Si-H bonds, but contains carboxyl and propionic acid groups (-CH 2 CH 2 COOH) content is 5.1wt%.

[0038] In a 250ml three-necked flask equipped with a reflux device, add 100g of low-hydrogen sil...

Embodiment 2

[0041] (1) Coating preparation

[0042] First, 4g of acrylic silicone wax SA1 and 0.2g of phenylboronic acid (PhB(OH) 2 ) and 10g of diluent propylene glycol monomethyl ether were mixed evenly, and slowly added to 20g of silica sol S2 (Grace Ludox CL-P, 40wt% water sol, pH=4, average particle size of 22nm) system under stirring, and the modified Reactive silica sol SS2. Divide SS2 into two halves, one half is used to observe the storage stability at room temperature, and the other half is slowly added a mixed solution of 10g methyltrimethoxysilane (MTMS) and 0.5g silane coupling agent KH560 under stirring, and continues to stir at room temperature After 2 hours, it is coated on the surface of the substrate and dried naturally to form a high-hardness high-temperature-resistant ceramic protective coating. The paint formulations are listed in Table 1.

[0043] Table 1: Example formula table (the unit is the number of parts, each corresponding to 0.1g)

[0044]

[0045] (2)...

example 2

[0051] The coatings configured in Example 2 were tested for their respective performances according to the above methods, and the results are listed in Table 3.

[0052] The storage stability experiment preliminarily shows that the gel time of the modified acidic silica sol of the present invention can be extended by 2 months.

[0053] The experimental results of the performance test show that the coating prepared by the present invention has excellent film-forming properties, is not easy to crack and pulverize, has excellent water resistance, and has excellent stain resistance (the lower the reflection coefficient decline rate, the higher the stain resistance it is good).

[0054] The results of accelerated curing of the coating film show that the coating film is cured at room temperature for 4 hours and then cured in an oven at 200°C for 2 hours, and the measured hardness is the same as that cured at room temperature for 3 days. Proper heat treatment can significantly speed...

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Abstract

The invention discloses a room-temperature-curing acrylic heteropolysiloxane nano-ceramic protection coating and a preparation method thereof, and belongs to the coating field. The preparation method comprises the followings steps: uniformly mixing 5-20 parts by weight of acrylic organosilicon wax, 1-10 parts by weight of a bifunctional organoboron compound and parts of an alcoholic dilutent, adding the obtained mixture to 100 parts of a nanometer silica sol system having a concentration of 10-40wt%, adding 100-200 parts by weight of methyltrimethoxy silane or its oligomer, 0.5-5 parts by weight of a silane coupling agent, residual parts of the alcoholic diluent and 0-50 parts by weight of a methyl MQ silicone resin mixed solution under stirring, and continuously stirring at room temperature for 1-2h to prepare a nano-ceramic protection coating; and the coating is coated on the surface of a substrate, and the formed coat is naturally dried to form a high-hardness high temperature resistant ceramic protection coat. The completely cured coat has a hardness reaching above 6H, can resistant a high temperature of 400DEG C, and has excellent water and stain resistances.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a room temperature curing acrylic heteropolysiloxane nano-ceramic protective coating and a preparation method thereof. Background technique [0002] Nano sol-gel technology has a wide range of applications in daily industrial production and life practice, and has been widely penetrated into all aspects of the modern ceramic industry. Hydrosol is a colloidal solution in which inorganic particles such as nano-scale silica, alumina, zirconia, and titanium oxide are evenly diffused in water. It has the advantages of environmental protection, non-combustibility, energy saving, low cost, high temperature resistance, weather resistance, and solvent resistance. One of the basic raw materials for the ceramic industry. Inorganic oxide ceramic coatings have excellent properties such as high temperature resistance, oxidation resistance, corrosion resistance, and wear resistance, but their disadvanta...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D183/06C09D7/12C04B41/84
Inventor 黄月文王斌
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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